School| stress|upset

Hey girls so last hear I didn't do very well in my classes. I'm in the academic stream. I have good work habits and I work hard. This year I have been wanting to improve my grades. I'm in grade 10. This year I understand everything I'm doing in class. But I still don't get the marks I'm hoping for. I would like to be in the 80's. My mom thinks I get test anxiety because I know all the info I need for the tests but I never do well. Also in English class my mark is a 68! Idk how that happens. I didn't think my work was that bad. My English teacher is so controlling tho. Everything has to be how she wants it. Nobody like her. Pleas help. Idk what to do